Well Problem Is Pakistan Buying From Outside isnt Always Cost Effective , and With Pakistan , You Should Always Keep Ban of Few Systems in Mind ,
And yes Pakistan Cant Spend Billions on Simple R & D Project but they need to invest with China Where Companies are already Working
Reason is Pakistan wants a independent Weapons Industry which can support its Land , Air , Sea , and Sub Sea Assets
For Now Its a Long Dream and Needs Work But there are already few smaller countries who heavy healthy Weapon Programs and they are making Good Money
Bonus Point For Pakistan is , Pakistan has a good reputation and Friendly Relations with Many Countries E.g Africa , Middle east , West , southeast Asia where they are already selling
If Pakistan Start small JVs With Companies From Turkey , China , South Africa , Italy where they have good Relations it will help in long term